Cat Pregnancy Due Date & Kittens Timeline
Estimate your cat’s due date from mating
Cat pregnancy due date and kittens timeline FAQ
How long are cats usually pregnant?
Most cats are pregnant for about 63 days from mating, with a common range of roughly 60–67 days. That is why this calculator uses a fixed 63-day gestation and shows a short birth window.
What date should I enter as the mating date?
Use the date your cat was most likely mated. For planned litters this is usually the first successful mating. If there were several days of mating, picking the middle day gives a reasonable estimate.
Why don’t I see options for different gestation lengths?
The goal of this tool is to stay very simple, so it always uses 63 days. Breeders and vets who prefer a slightly different number can shift dates themselves or use their own charts on top.
What do the pregnancy week and stage labels mean?
Days since mating are turned into a pregnancy week. Early means the first weeks after conception, mid is steady growth, and late is when nesting and obvious belly changes usually appear.
When should I call the vet about a late pregnancy?
If your cat goes past the birth window with no signs of labour, or seems unwell at any point, contact your vet. This calculator can highlight “past typical window” but only a vet can check that mum and kittens are still safe.
Can this calculator predict how many kittens there will be?
No. Litter size depends on many factors. Only imaging such as ultrasound or X-ray can give an idea of how many kittens to expect. Use this tool purely for timing.
What should I prepare as the due date approaches?
Near the due window, set up a quiet nesting box with soft bedding, easy access to water and a litter tray. Ask your vet which signs are normal labour and which mean you should call for help.
How to use this cat pregnancy due date calculator
This page is designed to keep cat pregnancy timing one-box simple. You enter a mating date, tap once, and the calculator returns a due date, birth window and a quick pregnancy stage label.
1. Choose the best mating or conception date
For planned breedings, enter the first clear mating. For surprise pregnancies, use the date your vet or your own notes suggest is most likely. If you are unsure, treat the result as a guide rather than a fixed promise.
2. Read the due date and birth window
After you click Calculate due date, the left side of the card shows a single estimated due date plus a short birth window a few days either side. That range is often more realistic than one exact day on the calendar.
3. Check pregnancy week and stage
The right side shows today’s date, an estimate of days and weeks pregnant, and whether your queen is in early, mid or late pregnancy, or past the usual window. This helps you match what you see at home with the rough week-by-week timeline.
4. Use the copy button for notes and vet chats
The Copy summary button grabs the key dates and stage labels into plain text. Paste it into your notes app, share it with family, or send it to your vet so everyone is looking at the same timing.
Remember that this is a planning tool, not medical advice. If anything about your cat’s behaviour, breathing, discharge or contractions feels wrong, call your vet even if the dates look fine.
How the cat pregnancy due date math works
The maths is kept as small as the form: one date in, one fixed gestation out. No extra boxes, sliders or options, just a standard 63-day pregnancy and a simple window around the result.
1. From mating date to due date
If you enter a mating date D, the due date is:
Due date = D + 63 days
This mirrors common guidance that cats are pregnant for about nine weeks. The tool never changes this number, which keeps results predictable and easy to compare.
2. Building the birth window
Because real queens can be a little early or late, the calculator also shows a birth window from four days before the due date to four days after it. That gives a realistic span to watch more closely.
3. Days pregnant, weeks and stage labels
Today’s date minus the mating date gives days pregnant. Dividing by seven and rounding down gives an approximate week of pregnancy. Cut-offs then label the stage as early, mid, late or past the window, matching typical week-by-week descriptions in simple language.
It is not a medical model; it is a calendar helper that lines up your notes and reminders with the usual 63-day gestation used for most domestic cats.
References and further reading on cat pregnancy and birth
Pair this simple due date tool with these trusted guides:
- Cats Protection — Caring for your pregnant cat — how long cats are pregnant, what to expect and how to prepare.
- International Cat Care — Cat birth: a guide to pregnancy and labour — normal labour signs, problems and when to call the vet urgently.
- MSD Veterinary Manual — Approximate gestation periods — veterinary table that includes the usual day range for domestic cats.
Always follow your own vet’s specific advice for your queen, her kittens and any past problems in pregnancy or birth.